What i think of Lyra is : She is like those actors and actresses that you always see playing in movies , but you don't know their name and you really like them. She keeps appearing everywere too. She was in Twilight Sparkle s home town on the bridge , remember , and then suddenly she is at Ponyville for the Summer Sun Celebration. Also she sometimes appears twice in one scene .
I think there will be super plot twist where Lyra is actually creator of the Mirror Pool because of her multiple copies everywhere, or maybe like a super secret scientist! I wish she would speak more